package com.hjl.tools;

public class Singleton {

    private static Singleton singleton;

    private Singleton() {

        //在整个应用运行期间是，只执行一次的业务代码操作（如读取配置文件的操作）

    }

    public static class SingletonHelper {
        private static final Singleton INSTANCE = new Singleton();
    }

    public static Singleton getInstance() {
        singleton = SingletonHelper.INSTANCE;
        return singleton;
    }

    public static Singleton test() {
        return singleton;
    }
}
